Remove IDs from filename

[thomasbtf]

• The file names contain IDs (between date and title), which internally refer to the documents in a unique way. I.e. these IDs should actually be replaced.
• As we build out this pipeline here, we should think about replacing IDs in both the structured and unstructured data with the same psuedonyms coming from an independent escrow. We are currently building that for the structured data anyway, so the extension should be fairly straightforward.